iOS之“微信支付”开发流程

实现微信支付的开发，iOS端里面只需要四个步骤：
- 向服务端请求预支付，获得prepayid以及noncestr；
- 把参数拼起来签名；
- 发起支付请求；
- 处理支付结果。
iOS的微信SDK的接入：即为“向微信注册你的应用程序id”、“下载微信终端SDK文件”、“搭建开发环境”、“在代码中使用开发工具包”。详情请参看：iOS微信接入指南。
导入微信支付库：开发者需要在工程中链接上:SystemConfiguration.framework,libz.dylib,libsqlite3.0.dylib，最重要的库是libc++.dylib；
iOS微信支付的具体流程：
- 向服务端请求预支付，获得prepayid以及noncestr

//提交预支付
- (NSString *)sendPrepay:(NSMutableDictionary *)prePayParams {NSString *prepayid = nil;//获取提交支付NSString *send = [self genPackage:prePayParams];//输出Debug Info[debugInfo appendFormat:@"API链接:%@\n", payUrl];[debugInfo appendFormat:@"发送的xml:%@\n", send];//发送请求post xml数据NSData *res = [WXUtil httpSend:payUrl method:@"POST" data:send];//输出Debug Info[debugInfo appendFormat:@"服务器返回：\n%@\n\n",[[NSString alloc] initWithData:res encoding:NSUTF8StringEncoding]];XMLHelper *xml  = [XMLHelper alloc];//开始解析[xml startParse:res];NSMutableDictionary *resParams = [xml getDict];//判断返回NSString *return_code   = [resParams objectForKey:@"return_code"];NSString *result_code   = [resParams objectForKey:@"result_code"];if ([return_code isEqualToString:@"SUCCESS"]) {//生成返回数据的签名NSString *sign      = [self createMd5Sign:resParams ];NSString *send_sign =[resParams objectForKey:@"sign"] ;//验证签名正确性if( [sign isEqualToString:send_sign]) {if( [result_code isEqualToString:@"SUCCESS"]) {//验证业务处理状态prepayid    = [resParams objectForKey:@"prepay_id"];return_code = 0;[debugInfo appendFormat:@"获取预支付交易标示成功！\n"];}}else{last_errcode = 1;[debugInfo appendFormat:@"gen_sign=%@\n   _sign=%@\n",sign,send_sign];[debugInfo appendFormat:@"服务器返回签名验证错误！！！\n"];}}else{last_errcode = 2;[debugInfo appendFormat:@"接口返回错误！！！\n"];}return prepayid;
}- (NSMutableDictionary *)sendPay_WithPrice:(NSString *)order_price orderNo:(NSString *)orderNo {//订单标题，展示给用户NSString *order_name = @"展示给用户的订单标题";//预付单参数订单设置srand( (unsigned)time(0) );NSString *noncestr  = [NSString stringWithFormat:@"%d", rand()];NSString *orderno   = orderNo;NSMutableDictionary *packageParams = [NSMutableDictionary dictionary];[packageParams setObject: appid          forKey:@"appid"];           //开放平台appid[packageParams setObject: mchid          forKey:@"mch_id"];          //商户号[packageParams setObject: @"APP-001"     forKey:@"device_info"];     //支付设备号或门店号[packageParams setObject: noncestr       forKey:@"nonce_str"];       //随机串[packageParams setObject: @"APP"         forKey:@"trade_type"];      //支付类型，固定为APP[packageParams setObject: order_name     forKey:@"body"];            //订单描述，展示给用户[packageParams setObject: NOTIFY_URL     forKey:@"notify_url"];      //支付结果异步通知[packageParams setObject: orderno        forKey:@"out_trade_no"];    //商户订单号[packageParams setObject: @"196.168.1.1" forKey:@"spbill_create_ip"];//发器支付的机器ip[packageParams setObject: order_price    forKey:@"total_fee"];       //订单金额，单位为分//获取prepayId（预支付交易会话标识）NSString *prePayid;prePayid = [self sendPrepay:packageParams];if ( prePayid != nil) {//获取到prepayid后进行第二次签名NSString *package, *time_stamp, *nonce_str;//设置支付参数time_t now;time(&now);time_stamp  = [NSString stringWithFormat:@"%ld", now];nonce_str    = [WXUtil md5:time_stamp];//重新按提交格式组包，微信客户端暂只支持package=Sign=WXPay格式，须考虑升级后支持携带package具体参数的情况package = @"Sign=WXPay";//第二次签名参数列表NSMutableDictionary *signParams = [NSMutableDictionary dictionary];[signParams setObject: appid        forKey:@"appid"];[signParams setObject: nonce_str    forKey:@"noncestr"];[signParams setObject: package      forKey:@"package"];[signParams setObject: mchid        forKey:@"partnerid"];[signParams setObject: time_stamp   forKey:@"timestamp"];[signParams setObject: prePayid     forKey:@"prepayid"];//生成签名NSString *sign = [self createMd5Sign:signParams];//添加签名[signParams setObject: sign forKey:@"sign"];[debugInfo appendFormat:@"第二步签名成功，sign＝%@\n",sign];//返回参数列表return signParams;}else{[debugInfo appendFormat:@"获取prepayid失败！\n"];}return nil;
}

把参数拼起来签名

//创建package签名
- (NSString*)createMd5Sign:(NSMutableDictionary*)dict {NSMutableString *contentString  =[NSMutableString string];NSArray *keys = [dict allKeys];//按字母顺序排序NSArray *sortedArray = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {return [obj1 compare:obj2 options:NSNumericSearch];}];//拼接字符串for (NSString *categoryId in sortedArray) {if (![[dict objectForKey:categoryId] isEqualToString:@""] && ![categoryId isEqualToString:@"sign"] && ![categoryId isEqualToString:@"key"]){[contentString appendFormat:@"%@=%@&", categoryId, [dict objectForKey:categoryId]];}}//添加key字段[contentString appendFormat:@"key=%@", spkey];//得到MD5 sign签名NSString *md5Sign =[WXUtil md5:contentString];//输出Debug Info[debugInfo appendFormat:@"MD5签名字符串：\n%@\n\n",contentString];return md5Sign;
}//获取package带参数的签名包
- (NSString *)genPackage:(NSMutableDictionary*)packageParams {NSString *sign;NSMutableString *reqPars=[NSMutableString string];//生成签名sign = [self createMd5Sign:packageParams];//生成xml的packageNSArray *keys = [packageParams allKeys];[reqPars appendString:@"<xml>\n"];for (NSString *categoryId in keys) {[reqPars appendFormat:@"<%@>%@</%@>\n", categoryId, [packageParams objectForKey:categoryId],categoryId];}[reqPars appendFormat:@"<sign>%@</sign>\n</xml>", sign];return [NSString stringWithString:reqPars];
}

发起支付请求

- (void)viewWillAppear:(BOOL)animated {[super viewWillAppear:animated];//支付结果通知注册[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getOrderPayResult:) name:@"ORDER_PAY_NOTIFICATION" object:nil];
}//调用微信支付
- (void)viewDidLoad {[super viewDidLoad];[self WXPay];
}#pragma mark -- 发起”微信支付“请求
- (void)WXPay {if (![WXApi isWXAppInstalled]) {UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"您还没有安装微信" message:nil preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {//跳转到微信的下载安装地址}];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];return ;}YDWWeChatPayResquest *req = [YDWWeChatPayResquest new];//初始化支付签名对象[req init:APP_ID mch_id:MCH_ID];//设置密钥[req setKey:PARTNER_ID];//获取到实际调起微信支付的参数后，在app端调起支付NSInteger payTheAmount;//支付金额NSString *orderMeony = [NSString stringWithFormat:@"%ld",payTheAmount];NSDictionary *orderDic;//支付订单NSString *orderNo = [orderDic objectForKey:@"orderNumber"];NSMutableDictionary *dict = [req sendPay_WithPrice:orderMeony orderNo: orderNo];if(dict == nil){//错误提示NSString *debug = [req getDebugifo];UIAlertController *alert = [UIAlertController alertControllerWithTitle:debug message:nil preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];}else{NSMutableString *stamp  = [dict objectForKey:@"timestamp"];//调起微信支付PayReq* req             = [[PayReq alloc] init];req.openID              = [dict objectForKey:@"appid"];req.partnerId           = [dict objectForKey:@"partnerid"];req.prepayId            = [dict objectForKey:@"prepayid"];req.nonceStr            = [dict objectForKey:@"noncestr"];req.timeStamp           = stamp.intValue;req.package             = [dict objectForKey:@"package"];req.sign                = [dict objectForKey:@"sign"];[WXApi sendReq:req];}
}- (void)weixinPay {YDWWeixinPayParams *signParams = [[YDWWeixinPayParams alloc] initWithPrepayid:self.prepay_id noncestr:self.nonce_str];//调起微信支付PayReq *req = [[PayReq alloc] init];req.openID = signParams.appid;req.partnerId = signParams.partnerid;req.prepayId = signParams.prepayid;req.nonceStr = signParams.noncestr;req.timeStamp = signParams.timestamp.intValue;req.package = signParams.package;req.sign = [signParams sign];[WXApi sendReq:req];
}#pragma mark - 支付结果通知信息
- (void)getOrderPayResult:(NSNotification *)notification{if ([notification.object isEqualToString:@"success"]) {UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"恭喜" message:@"您已成功支付啦!" preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];}else{UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"支付失败,可在待付款订单中查看" preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];}
}//移除通知
- (void)viewWillDisappear:(BOOL)animated{[[NSNotificationCenter defaultCenter]removeObserver:self];
}

- 处理支付结果，在AppDelegate中做的工作：
- 1、导入#import “WXApi.h”和#import “WXApiObject.h”，并遵守WXApiDelegate协议，要使你的程序启动后微信终端能响应你的程序，必须在代码中向微信终端注册你的id：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {[WXApi registerApp:@"WXAppId" withDescription:@"YDWWXPayDes"];return YES;
}

2、重写AppDelegate的handleOpenURL和openURL方法：

- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url
{if ([url.absoluteString hasPrefix:Weixin_Appid]) {return [WXApi handleOpenURL:url delegate:self];} return YES;
}- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {return [WXApi handleOpenURL:url delegate:self];
}

3、处理结果：

- (void)onResp:(BaseResp *)resp {NSString *strMsg = [NSString stringWithFormat:@"errcode:%d", resp.errCode];NSString *strTitle;if([resp isKindOfClass:[SendMessageToWXResp class]]) {strTitle = [NSString stringWithFormat:@"发送媒体消息结果"];}if([resp isKindOfClass:[PayResp class]]){//支付返回结果，实际支付结果需要去微信服务器端查询strTitle = [NSString stringWithFormat:@"支付结果"];switch (resp.errCode) {case WXSuccess:{strMsg = @"支付结果：成功！";NSLog(@"支付成功－PaySuccess，retcode = %d", resp.errCode);NSNotification *notification = [NSNotification notificationWithName:@"ORDER_PAY_NOTIFICATION" object:@"success"];[[NSNotificationCenter defaultCenter] postNotification:notification];break;}default:{strMsg = [NSString stringWithFormat:@"支付结果：失败！retcode = %d, retstr = %@", resp.errCode,resp.errStr];NSLog(@"错误，retcode = %d, retstr = %@", resp.errCode,resp.errStr);NSNotification *notification = [NSNotification notificationWithName:@"ORDER_PAY_NOTIFICATION" object:@"fail"];[[NSNotificationCenter defaultCenter] postNotification:notification];break;}}}//        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:strTitle message:strMsg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
//        [alert show];}

常见的问题：
- 如果跳转到微信里之只弹出了一个确定按钮，那么这时候需要检查几个方面：
- 1、appid，mch_id,partner_id是否设置正确。mch_id对应的key其实是partnerid，partner_id对应的key其实是key；
- 2、timestamp 应为10位；
- 3、签名需要排序，并用md5加密。
最后附上重要的类的全部代码：
- AppDelegate：

//  AppDelegate.h
//  微信支付
//
//  Created by YDW on 16/3/28.
//  Copyright © 2016年 IZHUO.NET. All rights reserved.
//#import <UIKit/UIKit.h>
#import "WXApi.h"
#import "WXApiObject.h"@interface AppDelegate : UIResponder <UIApplicationDelegate,WXApiDelegate>@property (strong, nonatomic) UIWindow *window;@end//  AppDelegate.m
//  微信支付
//
//  Created by YDW on 16/3/28.
//  Copyright © 2016年 IZHUO.NET. All rights reserved.
//#import "AppDelegate.h"@interface AppDelegate ()@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {[WXApi registerApp:@"WXAppId" withDescription:@"YDWWXPayDes"];return YES;
}- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {return [WXApi handleOpenURL:url delegate:self];
}- (BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url {return  [WXApi handleOpenURL:url delegate:self];
}- (void)onResp:(BaseResp *)resp {NSString *strMsg = [NSString stringWithFormat:@"errcode:%d", resp.errCode];NSString *strTitle;if([resp isKindOfClass:[SendMessageToWXResp class]]) {strTitle = [NSString stringWithFormat:@"发送媒体消息结果"];}if([resp isKindOfClass:[PayResp class]]){//支付返回结果，实际支付结果需要去微信服务器端查询strTitle = [NSString stringWithFormat:@"支付结果"];switch (resp.errCode) {case WXSuccess:{strMsg = @"支付结果：成功！";NSLog(@"支付成功－PaySuccess，retcode = %d", resp.errCode);NSNotification *notification = [NSNotification notificationWithName:@"ORDER_PAY_NOTIFICATION" object:@"success"];[[NSNotificationCenter defaultCenter] postNotification:notification];break;}default:{strMsg = [NSString stringWithFormat:@"支付结果：失败！retcode = %d, retstr = %@", resp.errCode,resp.errStr];NSLog(@"错误，retcode = %d, retstr = %@", resp.errCode,resp.errStr);NSNotification *notification = [NSNotification notificationWithName:@"ORDER_PAY_NOTIFICATION" object:@"fail"];[[NSNotificationCenter defaultCenter] postNotification:notification];break;}}}//        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:strTitle message:strMsg delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
//        [alert show];}

YDWWeChatPayResquest：

//  YDWWeChatPayResquest.h
//  微信支付
//
//  Created by YDW on 16/3/28.
//  Copyright © 2016年 IZHUO.NET. All rights reserved.
//#import <Foundation/Foundation.h>
#import "WXUtil.h"
#import "ApiXml.h"/** 账号的账户资料：更改商户后的相关参数后可以使用*/#define APP_ID        @"你的APP的ID"       //APPID
#define APP_SECRET    @"你的APP的secret"   //appsecret
#define MCH_ID        @"商户号"            //商户号，填写商户对应参数
#define PARTNER_ID    @"商户API密钥"       //商户API密钥，填写相应参数
#define NOTIFY_URL    @"回调页面地址"       //支付结果回调页面
#define SP_URL        @"服务器端支付数据地址"//获取服务器端支付数据地址（商户自定义）@interface YDWWeChatPayResquest : NSObject {//预支付的url地址NSString *payUrl;//lash_errcode;long     last_errcode;//debug信息NSMutableString *debugInfo;NSString        *appid,*mchid,*spkey;}- (BOOL)init:(NSString *)app_id mch_id:(NSString *)mch_id;
- (NSString *)getDebugifo;
- (long)getLasterrCode;
//设置商户密钥
- (void)setKey:(NSString *)key;
//创建package签名
- (NSString*)createMd5Sign:(NSMutableDictionary*)dict;
//获取package带参数的签名包
- (NSString *)genPackage:(NSMutableDictionary*)packageParams;
//提交预支付
- (NSString *)sendPrepay:(NSMutableDictionary *)prePayParams;- (NSMutableDictionary *)sendPay_WithPrice:(NSString *)order_price orderNo:(NSString *)orderNo;
//签名实例测试
//- (NSMutableDictionary *)sendPay_demo;
@end//  YDWWeChatPayResquest.m
//  微信支付
//
//  Created by YDW on 16/3/28.
//  Copyright © 2016年 IZHUO.NET. All rights reserved.
//#import <Foundation/Foundation.h>
#import "YDWWeChatPayResquest.h"@implementation YDWWeChatPayResquest- (BOOL)init:(NSString *)app_id mch_id:(NSString *)mch_id {payUrl     = @"https://api.mch.weixin.qq.com/pay/unifiedorder";if (debugInfo == nil){debugInfo = [NSMutableString string];}[debugInfo setString:@""];appid = app_id;mchid = mch_id;return YES;
}//设置商户密钥
- (void)setKey:(NSString *)key {spkey = [NSString stringWithString:key];
}//获取debug信息
- (NSString*)getDebugifo {NSString *res = [NSString stringWithString:debugInfo];[debugInfo setString:@""];return res;
}//获取最后服务返回错误代码
- (long)getLasterrCode {return last_errcode;
}//创建package签名
- (NSString*)createMd5Sign:(NSMutableDictionary*)dict {NSMutableString *contentString  =[NSMutableString string];NSArray *keys = [dict allKeys];//按字母顺序排序NSArray *sortedArray = [keys sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {return [obj1 compare:obj2 options:NSNumericSearch];}];//拼接字符串for (NSString *categoryId in sortedArray) {if (![[dict objectForKey:categoryId] isEqualToString:@""] && ![categoryId isEqualToString:@"sign"] && ![categoryId isEqualToString:@"key"]){[contentString appendFormat:@"%@=%@&", categoryId, [dict objectForKey:categoryId]];}}//添加key字段[contentString appendFormat:@"key=%@", spkey];//得到MD5 sign签名NSString *md5Sign =[WXUtil md5:contentString];//输出Debug Info[debugInfo appendFormat:@"MD5签名字符串：\n%@\n\n",contentString];return md5Sign;
}//获取package带参数的签名包
- (NSString *)genPackage:(NSMutableDictionary*)packageParams {NSString *sign;NSMutableString *reqPars=[NSMutableString string];//生成签名sign = [self createMd5Sign:packageParams];//生成xml的packageNSArray *keys = [packageParams allKeys];[reqPars appendString:@"<xml>\n"];for (NSString *categoryId in keys) {[reqPars appendFormat:@"<%@>%@</%@>\n", categoryId, [packageParams objectForKey:categoryId],categoryId];}[reqPars appendFormat:@"<sign>%@</sign>\n</xml>", sign];return [NSString stringWithString:reqPars];
}//提交预支付
- (NSString *)sendPrepay:(NSMutableDictionary *)prePayParams {NSString *prepayid = nil;//获取提交支付NSString *send = [self genPackage:prePayParams];//输出Debug Info[debugInfo appendFormat:@"API链接:%@\n", payUrl];[debugInfo appendFormat:@"发送的xml:%@\n", send];//发送请求post xml数据NSData *res = [WXUtil httpSend:payUrl method:@"POST" data:send];//输出Debug Info[debugInfo appendFormat:@"服务器返回：\n%@\n\n",[[NSString alloc] initWithData:res encoding:NSUTF8StringEncoding]];XMLHelper *xml  = [XMLHelper alloc];//开始解析[xml startParse:res];NSMutableDictionary *resParams = [xml getDict];//判断返回NSString *return_code   = [resParams objectForKey:@"return_code"];NSString *result_code   = [resParams objectForKey:@"result_code"];if ([return_code isEqualToString:@"SUCCESS"]) {//生成返回数据的签名NSString *sign      = [self createMd5Sign:resParams ];NSString *send_sign =[resParams objectForKey:@"sign"] ;//验证签名正确性if( [sign isEqualToString:send_sign]) {if( [result_code isEqualToString:@"SUCCESS"]) {//验证业务处理状态prepayid    = [resParams objectForKey:@"prepay_id"];return_code = 0;[debugInfo appendFormat:@"获取预支付交易标示成功！\n"];}}else{last_errcode = 1;[debugInfo appendFormat:@"gen_sign=%@\n   _sign=%@\n",sign,send_sign];[debugInfo appendFormat:@"服务器返回签名验证错误！！！\n"];}}else{last_errcode = 2;[debugInfo appendFormat:@"接口返回错误！！！\n"];}return prepayid;
}- (NSMutableDictionary *)sendPay_WithPrice:(NSString *)order_price orderNo:(NSString *)orderNo {//订单标题，展示给用户NSString *order_name = @"展示给用户的订单标题";//预付单参数订单设置srand( (unsigned)time(0) );NSString *noncestr  = [NSString stringWithFormat:@"%d", rand()];NSString *orderno   = orderNo;NSMutableDictionary *packageParams = [NSMutableDictionary dictionary];[packageParams setObject: appid          forKey:@"appid"];           //开放平台appid[packageParams setObject: mchid          forKey:@"mch_id"];          //商户号[packageParams setObject: @"APP-001"     forKey:@"device_info"];     //支付设备号或门店号[packageParams setObject: noncestr       forKey:@"nonce_str"];       //随机串[packageParams setObject: @"APP"         forKey:@"trade_type"];      //支付类型，固定为APP[packageParams setObject: order_name     forKey:@"body"];            //订单描述，展示给用户[packageParams setObject: NOTIFY_URL     forKey:@"notify_url"];      //支付结果异步通知[packageParams setObject: orderno        forKey:@"out_trade_no"];    //商户订单号[packageParams setObject: @"196.168.1.1" forKey:@"spbill_create_ip"];//发器支付的机器ip[packageParams setObject: order_price    forKey:@"total_fee"];       //订单金额，单位为分//获取prepayId（预支付交易会话标识）NSString *prePayid;prePayid            = [self sendPrepay:packageParams];if ( prePayid != nil) {//获取到prepayid后进行第二次签名NSString    *package, *time_stamp, *nonce_str;//设置支付参数time_t now;time(&now);time_stamp  = [NSString stringWithFormat:@"%ld", now];nonce_str  = [WXUtil md5:time_stamp];//重新按提交格式组包，微信客户端暂只支持package=Sign=WXPay格式，须考虑升级后支持携带package具体参数的情况package         = @"Sign=WXPay";//第二次签名参数列表NSMutableDictionary *signParams = [NSMutableDictionary dictionary];[signParams setObject: appid        forKey:@"appid"];[signParams setObject: nonce_str    forKey:@"noncestr"];[signParams setObject: package      forKey:@"package"];[signParams setObject: mchid        forKey:@"partnerid"];[signParams setObject: time_stamp   forKey:@"timestamp"];[signParams setObject: prePayid     forKey:@"prepayid"];//生成签名NSString *sign = [self createMd5Sign:signParams];//添加签名[signParams setObject: sign forKey:@"sign"];[debugInfo appendFormat:@"第二步签名成功，sign＝%@\n",sign];//返回参数列表return signParams;}else{[debugInfo appendFormat:@"获取prepayid失败！\n"];}return nil;
}@end

调用微信支付的页面：

@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {[super viewDidLoad];[self WXPay];
}- (void)viewWillAppear:(BOOL)animated {[super viewWillAppear:animated];//支付结果通知注册[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getOrderPayResult:) name:@"ORDER_PAY_NOTIFICATION" object:nil];
}#pragma mark -- 发起”微信支付“请求
- (void)WXPay {if (![WXApi isWXAppInstalled]) {UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"您还没有安装微信" message:nil preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {//跳转到微信的下载安装地址}];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];return ;}YDWWeChatPayResquest *req = [YDWWeChatPayResquest new];//初始化支付签名对象[req init:APP_ID mch_id:MCH_ID];//设置密钥[req setKey:PARTNER_ID];//获取到实际调起微信支付的参数后，在app端调起支付NSInteger payTheAmount;//支付金额NSString *orderMeony = [NSString stringWithFormat:@"%ld",payTheAmount];NSDictionary *orderDic;//支付订单NSString *orderNo = [orderDic objectForKey:@"orderNumber"];NSMutableDictionary *dict = [req sendPay_WithPrice:orderMeony orderNo: orderNo];if(dict == nil){//错误提示NSString *debug = [req getDebugifo];UIAlertController *alert = [UIAlertController alertControllerWithTitle:debug message:nil preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];}else{NSMutableString *stamp  = [dict objectForKey:@"timestamp"];//调起微信支付PayReq* req             = [[PayReq alloc] init];req.openID              = [dict objectForKey:@"appid"];req.partnerId           = [dict objectForKey:@"partnerid"];req.prepayId            = [dict objectForKey:@"prepayid"];req.nonceStr            = [dict objectForKey:@"noncestr"];req.timeStamp           = stamp.intValue;req.package             = [dict objectForKey:@"package"];req.sign                = [dict objectForKey:@"sign"];[WXApi sendReq:req];}
}#pragma mark - 支付结果通知信息
- (void)getOrderPayResult:(NSNotification *)notification{if ([notification.object isEqualToString:@"success"]) {UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"恭喜" message:@"您已成功支付啦!" preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];}else{UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"支付失败,可在待付款订单中查看" preferredStyle:UIAlertControllerStyleAlert];UIAlertAction *sureAction = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:nil];[alert addAction:sureAction];[self.navigationController presentViewController:alert animated:YES completion:nil];}
}//移除通知
- (void)viewWillDisappear:(BOOL)animated{[[NSNotificationCenter defaultCenter]removeObserver:self];
}@end

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